<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        /*子孙后代选择器
        body div div p {
            color: red;
        }*/
        /*子元素选择器*/
        div>div>p {
            color: blue;
        }
        /*伪类选择器*/
        a:link{color: red} /*未访问的状态*/
        a:visited{color: green} /*访问过的状态*/
        a:hover{color: yellow} /*悬停状态*/
        a:active{color: pink} /*点击状态*/
    </style>
</head>
<body>
<a href="https://www.tmooc.cn/">超链接1</a>
<a href="https://pvp.qq.com/">超链接2</a>
<a href="https://www.baidu.com/">超链接3</a>

<p>p1</p>
<div>
  <p>p2</p>
  <div><p>p3</p></div>
  <div>
    <p>p4</p>
    <div><p>p5</p></div>
  </div>
</div>

</body>
</html>